چكيده به لاتين
Due to the great progress in the field of transcendental in recent years, the need to expand the theoretical relationships to analyze them becomes more apparent. Among the various methods available in this dissertation, local field theory is used using the GSTC boundary conditions due to its high flexibility in analysis as well as giving physical intuition about the principle mechanism of metasurfaces. On the other hand, in recent years, although metasurface angular scattering engineering has been favorably considered in various telecommunication applications, including analog processors. So far, however, there has been no organized approach to designing this type of metasurface, and current designs are largely based on the initiative of researchers. In the first chapter, we will show that by understanding the effect of the susceptibility or polarizability components of a bi-anisotropic metasurface in general, the reflection and transmission coefficients of the nanoparticle array can be controlled according to the incident wave angle. The anguler dispersion engineering has been used to design metasurface processors and solve the current challenges in them. In the second chapter, we will show that the susceptibility components perpendicular to the surface of a bi-isotropic structure have a non-negligible effect on the angular features of transmission or reflection coefficients, and ignoring them, which occurs in most common designs, greatly reduces the degree of freedom of the design. In the third chapter, the possibility of realizing a reciprocal reflective metasurface processor with the ability to operate against normal illuminations has been fully investigated by various methods, including the use of cross polarization processing channels and the use of higher order Floquet modes. The fourth chapter proposes a versatile metasurface processor using time-space modulation, the accuracy of its performance has been measured in the form of simulations and laboratory tests. The sixth chapter, in continuation of the activities carried out in the first three chapters, deals with the extraction of 36 susceptibility and polarizability elements of an anisotropic linear anisotropic metasurface in the most general state. This is despite the fact that until now, the methods of extracting surface susceptibilities have been limited to 16 horizontal ones and there has been no mention of the recovery of components perpendicular to the surface, the importance of which has been determined in this thesis. The advantages of using the proposed methods compared to other researches are given separately in each chapter.
